Grub Customizer is a software package that does exactly as the name would imply. It allows the user to customize different aspects of the grub boot menu – such as the order that entries appear in the list, how long grub waits before selecting a default system to boot to, etc.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-install-grub-customizer-on-linux-all-major-distros